| 摘要: |
| 高精度寻北是旋转调制光纤陀螺惯导实现高精度导航的前提，也是其技术优势的体现。本文针对当前旋转调制光纤陀螺惯导在快速高精度寻北中遇到的问题，对其寻北精度极限进行了深入研究，梳理出4项最主要的影响因素，对其影响机理、误差模型、量级进行了深入的分析，并通过样机试验进行了验证。结果表明，尽管随机游走系数是制约寻北精度极限的最终因素，但陀螺刻度系数误差、扰动速度、航向效应等误差处理不好，将严重影响旋转调制寻北精度；通过采取措施，高精度光纤陀螺旋转调制惯导5min寻北精度已达到35″（3σ），进一步提高精度的措施正在研究中。 |
| 关键词: 寻北精度极限 旋转调制 光纤陀螺 随机游走 航向效应 |
| DOI： |
|
| 基金项目: |
|
| Research on North-seeking Precision Limit of Rotation-modulating FOG-SINS |
| XU Hai gang,Guo Yuan-jiang,LI Zhi-feng,LI Hai-jun,LIU Chong |
| (Beijing Automatic Control and Equipment Institute) |
| Abstract: |
| The premise of rotation-modulating FOG-SINS achieving high accuracy navigation is high precision north-seeking, which is the embodiment of technical advantage. Aiming at the problem of quick and high accuracy north-seeking with rotation-modulating FOG-SINS,we study deeply on the precision limit of north-seeking. Four main influence factors are carded.We analyze deeply the influencing mechanism, error model and magnitude. A validation is made with test prototype. The result shows that though random walk is the final factor to restrict north-seeking precision limit, it will confine the precision a lot if gyroscopes scale factor error, perturbation velocity and heading effect cannot be dealed well. Through taking measures, the north-seeking precision of high accuracy rotation-modulating FOG-SINS can reach 35″ within 5min. |
| Key words: North-seeking precision limit Rotation-modulation FOG Random walk Heading effect |
